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Vigil@nce - Xen: memory corruption via IOMMU TLB Flushes Undue Deferral

December 2020 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2

SYNTHESIS OF THE VULNERABILITY

Impacted products: XenServer, Debian, Fedora, openSUSE Leap, SUSE
Linux Enterprise Desktop, SLES, Xen.

Severity: 2/4.

Consequences: administrator access/rights, denial of service on
server, denial of service on service.

Provenance: user shell.

Confidence: confirmed by the editor (5/5).

Creation date: 20/10/2020.

DESCRIPTION OF THE VULNERABILITY

An attacker, inside a guest system, can trigger a memory
corruption via IOMMU TLB Flushes Undue Deferral of Xen, in order
to trigger a denial of service, and possibly to run code on the
host system.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Xen-memory-corruption-via-IOMMU-TLB-Flushes-Undue-Deferral-33632


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